Greetings. I have a rather large collection of Motorola professional series radios stockpiled and figured I’d use a few of them to cobble together a home brew UHF repeater. Picked out two of them, got them programmed and tested their RF and they’re both great on simplex. When I went to go plug in the RICK interface to make it a full duplex repeater, I realized that this device [See attached photos] was in one of the units. When I removed it, the radio refused to turn on until I put it back. Looks like some kind of RJ45 connector on the back with a power jumper. Can anybody help me identify what this device is or what it does? Also, how to remove it and put back the original pins? I’ve only got the two units in UHF and really don’t want to spend another $300 on another one. Any help is appreciated. Thx.
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CDM Rear accessory port - Mysterious device
- Thread starter KD2UVY
- Start date
dickie757
Wired
Replicate the jumper without the board in place to see if it will power up. What is the radio?
Edit, not the power lead looking thing, the black wire jumper
Edit, not the power lead looking thing, the black wire jumper
The radio is a CDM 1550 UHF R1 (NON-LS). I’ll have to test the jumper method momentarily when I’m at my bench
The jumper appears to simply be between pins 7&9 for waking the radio on power up.
I realized I never reprogrammed the radio for ignition & on/off and it was tied to strictly ignition. That’s been changed and it now turns on with the front power button with this thing removed.
I suppose my next question(s) would be:
What was this device for?
What’s the power lead from potentially?
How would I go about putting the factory pin connector back? (I have a donor radio I can pull from if needed)
From W9CR...
"The accessory connector is a TE AMP connector Digi-key part number 104422-2-ND, and uses Digi-Key Part number A25989-ND for the pins.
This is the same series used by the Radius and Maxtrac radios and much like an RJ45/RJ11 connector the smaller connectors will work for everything other than flashing or programing the Pro Series mobiles. What this means is accessories for the radius (R.I.C.K., Etc.) will work on the CDM with no modifications. Refer to the image below to see how this works."
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